<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt />
      </div>
      <!-- 登陆表单区域 -->
      <el-form
        :model="loginForm"
        label-width="0px"
        class="login_form"
        :rules="loginFormRules"
        ref="loginFormRef"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="el-icon-s-custom"></el-input>
        </el-form-item>
        <!-- 用户密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="el-icon-lock" type="password"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      //表单登录的数据绑定
      loginForm: {
        username: "admin",
        password: "123456"
      },
      //这是表单的验证规则的对象
      loginFormRules: {
        //验证用户名是否合法
        username: [
          { required: true, message: "请输登录名称", trigger: "blur" },
          { min: 3, max: 8, message: "长度在 3 到 10 个字符", trigger: "blur" }
        ],
        //验证密码是否合法
        password: [
          { required: true, message: "请输登录名称", trigger: "blur" },
          { min: 6, max: 15, message: "长度在 6 到 15 个字符", trigger: "blur" }
        ]
      }
    };
  },
  methods: {
    //点击重置按钮,重置登录表单
    resetLoginForm() {
      //resetFields是element-ui中的方法
      this.$refs.loginFormRef.resetFields();
    },
    //对整个表单进行校验的方法，参数为一个回调函数。该回调函数会在校验结束后被调用
    login() {
      //第一个参数是一个布尔值
      console.log(this.$refs.loginFormRef);
      //validate是element-ui中表单的验证的方法
      this.$refs.loginFormRef.validate(async valid => {
        //当返回值不为真时则直接return出去
        if (!valid) return;
        //解构赋值
        const { data: res } = await this.axios.post("login", this.loginForm);
        console.log(res);
        if (res.meta.status !== 200) return this.$message.error("登录失败");
        this.$message.success("登陆成功");
        window.sessionStorage.setItem("token",res.data.token) //将token保存在sessionstorage中
        //编程式导航跳转到主页面,路由地址是"/home"
        this.$router.push("/home")
      });
    }
  }
};
</script>

<style lang="less" scoped>
.login_container {
  height: 100%;
  background-color: #2b4b6b;
  position: relative;
  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 10px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    .avatar_box {
      width: 130px;
      height: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      top: 0;
      transform: translate(-50%, -50%);
      background-color: #fff;
      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
  }
}
.btns {
  display: flex;
  justify-content: flex-end;
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
</style>
